WO2013023539A1

WO2013023539A1 - Method for calibrating transmission gsm frequency band power of mobile terminal

Info

Publication number: WO2013023539A1
Application number: PCT/CN2012/079752
Authority: WO
Inventors: 白剑
Original assignee: 惠州Tcl移动通信有限公司
Priority date: 2011-08-16
Filing date: 2012-08-07
Publication date: 2013-02-21
Also published as: CN102324991A; CN102324991B

Abstract

Disclosed is a method for calibrating the transmission GSM frequency band power of a mobile terminal, including: a calibration system setting a reference channel and reference radio frequency signal line loss of a corresponding working frequency band, the calibration system setting a radio frequency parameter of a mobile terminal, the mobile terminal successively outputting a series of signals with different powers, and a base station emulator of the calibration system reading and storing the corresponding parameters of various power signals; setting a radio frequency signal line loss corresponding to the next channel of the corresponding working frequency band; and the calibration system setting the radio frequency parameter of the mobile terminal, the mobile terminal successively outputting a series of signals with different powers, and the base station emulator reading and storing the corresponding parameters of various power signals. The present invention can set different target powers for different channels. By way of setting corresponding radio frequency signal line losses, the calibration accuracy is improved, which is convenient for debugging mobile phone antennas, and a significant progress over the prior art.

Description

Method for calibrating mobile terminal to transmit GSM band power

Technical field

The present invention relates to the field of communications, and in particular, to a method for calibrating a mobile terminal to transmit power in a GSM band.

Background technique

Today's mobile terminals support more and more frequency bands, and in the direction of small and light, the design of mobile phone antennas will bring greater challenges. At the same time, in order to improve the user experience and increase network capacity and efficiency, operators and users have higher and higher requirements on the antenna performance of mobile terminals. Under the pinch of the above two requirements, the antenna design of the mobile terminal becomes more and more difficult.

The passive S11 diagram of a typical antenna, as shown in Figure 1, can clearly show that the performance of different channel antennas is different in the same frequency band. Taking the GSM850 frequency band as an example, the low channel CH128 frequency is 824.2MHz, and the high channel CH251 The main frequency is 848.8MHz. TRP (Total Radiated in OTA (Over The Air)) if the transmit power is set to the same Power: Total radiant power) must be high or low. In order to ensure that all channels reach the standard, the TRP of the channel with better antenna performance (such as the CH251 channel in Figure 1) is bound to be relatively high. This is for the SAR of CH251 (Specific Compatibility of Absorption Rate and HAC (Hearing Aids Compatibility: immunity of electromagnetic interference of hearing aids) is very difficult.

The existing solution requires the antenna to adjust the antenna model and antenna matching to forcibly flatten the TRP of different channels. This practice will increase the difficulty of antenna debugging. On some mobile terminal platforms, such as the Qualcomm platform, such features are not provided. That is to say, the target power of different channels in the same frequency band must be set to the same value, resulting in lower calibration efficiency and poor calibration accuracy.

As shown in FIG. 2, it is a typical calibration framework in the prior art. The mobile terminal and the computer are connected through a serial port or a USB. The computer is also connected to the base station emulator (typically CMU200 or Agilent 8960, etc.) through the GPIB interface. The interface controls the base station emulator and reads the signals measured by the base station emulator; its typical power calibration procedure is generally as follows:

The calibration system commands the terminal to enter the calibration mode;

The calibration system commands the terminal to enter a working frequency band, such as the GSM850 channel;

The calibration system commands the base station emulator (typically CMU200 or Agilent 8960, etc.) to enter the test mode;

Set a fixed RF signal line loss (different operating band loss is different);

On some platforms (such as Qualcomm platform), the calibration system sets the RF parameters of the mobile terminal (including the calibration channel, the transmission path power control parameters), instructs the terminal to continuously output a series of different power signals, and controls the base station emulator to read the series of signals. Control parameters, output power data, phase data and store the set of parameters;

In other platforms (such as the MTK platform), the calibration system sets the radio frequency parameters of the mobile terminal and commands the transmission of the signal, and then reads the signal power transmitted by the terminal through the base station emulator; if the power and target value error is not within the set range; then the modification The radio frequency parameters of the terminal are transmitted again and the power is read again; the steps are repeated until the terminal transmit power and the target power are equal or the difference is within the allowable range set by the system; then the set of radio frequency parameters is stored;

The calibration system commands the mobile terminal and the base station emulator to enter another working frequency band;

Repeat the above operation;

When all working frequency bands supported by the mobile terminal are calibrated, all the calibrated RF parameters are stored in the mobile terminal memory, and then the calibration is exited.

It can be seen from the above steps that the RF line loss used by different channels in the same working frequency band is the same, which reduces the accuracy of calibration and cannot accurately calibrate the RF parameters of different channels in the same frequency band.

It can be seen that the prior art needs further improvement and development.

Summary of the invention

The present invention provides a method for calibrating the power of the mobile terminal to transmit the GSM frequency band in order to solve the defects in the prior art, and solves the technical problem that the radio frequency parameters of different channels on the same frequency band cannot be accurately calibrated, and the target power of different channels cannot be set, so as to improve the technical problem. Calibration accuracy for easy debugging of the mobile phone antenna.

In order to solve the above technical problem, the solution of the present invention includes:

A method for calibrating a mobile terminal to transmit power in a GSM band includes the following steps:

A. The mobile terminal enters a corresponding working frequency band, the calibration system sets a reference channel of the corresponding working frequency band and a reference radio frequency signal line loss, the calibration system sets a radio frequency parameter of the mobile terminal, and the mobile terminal continuously outputs a series of different powers a signal, the base station emulator of the calibration system reads and stores corresponding parameters of the respective power signals;

B. setting a corresponding radio frequency signal line loss of the next channel of the corresponding working frequency band according to the reference radio frequency signal line loss;

C. The calibration system commands the base station emulator to test the next channel, the calibration system sets radio frequency parameters of the mobile terminal, and the mobile terminal continuously outputs a series of different power signals, and the base station emulator reads The corresponding parameters of the respective power signals are taken and stored.

The calibration method, wherein the step B further comprises: the corresponding radio frequency signal line loss is a sum of a reference signal line loss and a radio frequency signal line loss compensation value, and the radio frequency signal line loss compensation value is a target channel target power. The difference from the target power of the next channel.

The calibration method, wherein before the step A, the mobile terminal accesses the calibration system, and the mobile terminal is in a calibration mode.

The calibration method, wherein the calibration method further includes repeating the step B and the step C to obtain corresponding parameters of each channel of the corresponding working frequency band, and the base station emulator will each of the corresponding working frequency bands Corresponding parameters of the channels are stored in the mobile terminal.

The calibration method, wherein the radio frequency parameter is a calibration channel and a transmit path energy control parameter.

The calibration method, wherein the corresponding parameter in the step C is a control parameter, an output power parameter and a phase parameter of the corresponding power signal.

The calibration method, wherein the calibration method further comprises the calibration system instructing the base station emulator to calibrate another working frequency band of the mobile terminal, and repeating the step A to the step C.

The calibration method, wherein the calibration method further comprises the calibration system exiting calibration after the calibration system calibrates all working frequency bands of the mobile terminal.

The invention provides a method for calibrating the power of the mobile terminal to transmit the GSM frequency band, which can set different target powers for different channels, and set the corresponding radio frequency signal line loss, thereby achieving accurate calibration of different channels of the same working channel, and improving The accuracy of the calibration facilitates the debugging of the mobile phone antenna and is a great advancement in the prior art.

DRAWINGS

1 is a passive S11 diagram of a mobile terminal antenna in the prior art;

2 is a schematic structural view of a typical calibration frame in the prior art;

Figure 3 is a schematic flow chart of the calibration method in the present invention.

detailed description

The present invention provides a method for calibrating the power of the mobile terminal to transmit the GSM frequency band. In order to make the objects, technical solutions and advantages of the present invention clearer and more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

The invention provides a method for calibrating the power of the mobile terminal to transmit the GSM frequency band, and sets the corresponding radio frequency signal line loss for each channel of the same working frequency band, thereby realizing accurate calibration of different channels of the same working channel respectively. As shown in Figure 1, it mainly includes the following steps:

Step 101: The mobile terminal enters a corresponding working frequency band, the calibration system sets a reference channel of the corresponding working frequency band and a reference radio frequency signal line loss, the calibration system sets a radio frequency parameter of the mobile terminal, and the mobile terminal continuously outputs a series of different a power signal, the base station emulator of the calibration system reads and stores corresponding parameters of the respective power signals;

Step 102: Set a corresponding radio frequency signal line loss of the next channel of the corresponding working frequency band according to the reference radio frequency signal line loss;

Step 103: The calibration system commands the base station emulator to test the next channel, the calibration system sets radio frequency parameters of the mobile terminal, and the mobile terminal continuously outputs a series of different power signals, the base station emulator The corresponding parameters of the respective power signals are read and stored.

In order to further improve the performance of the present invention, the step 102 further includes: the corresponding radio frequency signal line loss is a sum of a reference signal line loss and a radio frequency signal line loss compensation value, and the radio frequency signal line loss compensation value is a target of the reference channel. The difference between the power and the target power of the next channel.

Further, before the step 101, the mobile terminal accesses the calibration system, and the mobile terminal is in a calibration mode.

Further, the calibration method further includes repeating the step 102 and the step 103 to obtain corresponding parameters of each channel of the corresponding working frequency band, and the base station emulator corresponding to each channel of the corresponding working frequency band The parameters are stored in the mobile terminal.

Further, the radio frequency parameters are calibration channel and transmission path energy control parameters.

Further, the corresponding parameter in the step 103 is a control parameter, an output power parameter and a phase parameter of the corresponding power signal.

Further, the calibration method further includes the calibration system instructing the base station emulator to calibrate another working frequency band of the mobile terminal, and repeating the step 101 to the step 103.

Further, the calibration method further includes the calibration system exiting calibration after the calibration system calibrates all working frequency bands of the mobile terminal.

In order to further describe the present invention, a detailed description will be made using the GSM band calibration system as an example.

If the first value of NV_GSM_POWER_LEVELS_I of GSM850 is set to 3200, the target power of GSM850's maximum power (power level 5) is 32dBm, if it is set to 3250 then the maximum power is 32.5dBm and so on.

Suppose we require GSM850 channel low channel (CH128) target power P _{target, Lo} is 32dBm, high channel (CH251) target power P _{target, Hi} is 33dBm, of which low channel (CH128) is the reference channel, its RF signal line loss For the reference RF signal line loss CabLoss _normal , the target power difference between the two channels is the RF signal line loss compensation value, ie Offset = P _{target, Lo} - P _{target, Hi} , which is 32-33 = -1 in this example. . Then the implementation process is as follows:

a, the calibration system commands the mobile terminal to enter the calibration mode

b. The calibration system commands the mobile terminal to enter a working frequency band, in this example, a GSM850 frequency band;

c. The calibration system commands the base station emulator (the typical base station emulator has CMU200 or Agilent 8960, etc.) to enter the test mode;

d, the calibration system sets the reference radio frequency signal line loss CabLoss _normal , where the general normal value is 0.5 dB;

e. calibrating a low channel (CH128), the calibration system setting a radio frequency parameter of the mobile terminal, the radio frequency parameter including a calibration channel and a transmission path energy control parameter, the calibration system simultaneously instructing the mobile terminal to continuously output a series of different power signals, and controlling the base station emulator to read the control parameters, output power data, phase data of the series of signals and store the set of parameters;

f. The calibration system sets a corresponding radio frequency signal line loss of the high channel (CH251), CabLoss _new = CabLoss _normal + offset, where CabLoss _new = 0.5 dB + (-1) = -0.5 dB.

J. calibrating a high channel (CH251), the calibration system setting a radio frequency parameter of the mobile terminal, the radio frequency parameter including a calibration channel and a transmission path energy control parameter, the calibration system simultaneously instructing the mobile terminal to continuously output a series of different power signals, and controlling the base station emulator to read the control parameters, output power data, phase data of the series of signals and store the set of parameters;

h. The calibration system stores all the radio frequency parameters that are calibrated into the memory of the mobile terminal. Then the calibration system exits the calibration, that is, the calibration of the GSM850 frequency band is completed.

It can be known from the above algorithm that the key is the step f. If the radio frequency signal line loss is not reset, but the normal line loss is used, the target power must be 32 dBm after the high channel (CH251) is calibrated.

In the high channel (CH251) calibration process of the present invention, in order for the base station emulator to read 32 dBm of power, the terminal needs to increase the transmission power. Because the base station emulator reports the measured power value P _measured = P _real + CableLoss to the calibration system, where P _real is the actual power reaching the base station emulator RF port.

Now CableLoss is 1dB less than the true value (0.5dB). In order to get the same P _measured , P _real must increase by 1dB. If P _{real is} to be increased, the power transmitted by the mobile terminal must be increased by 1 dB.

It can be seen from the above analysis that the present invention can conveniently complete the function of setting different channels of different frequencies in the same frequency band of GSM to different target powers, improving the calibration accuracy and facilitating the debugging of the mobile phone antenna.

It should be understood that the above description of the preferred embodiments is not to be construed as limiting the scope of the present invention. In the case of the scope of the invention, it is possible to make various modifications, such as alternatives, simple combinations, etc., which fall within the scope of the invention, and the scope of the invention should be determined by the appended claims.

Claims

A method for calibrating a mobile terminal to transmit power in a GSM band includes the following steps:

A. The mobile terminal enters a corresponding working frequency band, the calibration system sets a reference channel of the corresponding working frequency band and a reference radio frequency signal line loss, the calibration system sets a radio frequency parameter of the mobile terminal, and the mobile terminal continuously outputs a series of different powers a signal, the base station emulator of the calibration system reads and stores corresponding parameters of the respective power signals;

B. setting a corresponding radio frequency signal line loss of the next channel of the corresponding working frequency band according to the reference radio frequency signal line loss;

C. The calibration system commands the base station emulator to test the next channel, the calibration system sets radio frequency parameters of the mobile terminal, and the mobile terminal continuously outputs a series of different power signals, and the base station emulator reads Taking and storing corresponding parameters of respective power signals;

The step B further includes: the corresponding radio frequency signal line loss is a sum of a reference signal line loss and a radio frequency signal line loss compensation value, and the radio frequency signal line loss compensation value is a target channel target power and a target of the next channel The difference in power.
The calibration method according to claim 1, wherein the step A further comprises the mobile terminal accessing the calibration system, and the mobile terminal is in a calibration mode.
The calibration method according to claim 1, wherein the calibration method further comprises repeating the step B and the step C to obtain corresponding parameters of each channel of the corresponding working frequency band, and the base station emulator will Corresponding parameters of each channel of the corresponding working frequency band are stored in the mobile terminal.
The calibration method according to claim 3, wherein the corresponding parameter in the step C is a control parameter, an output power parameter and a phase parameter of the corresponding power signal.
The calibration method according to claim 3, wherein the calibration method further comprises the calibration system instructing the base station emulator to calibrate another operating frequency band of the mobile terminal, and repeating the step A to the step C .
The calibration method according to claim 5, wherein the calibration method further comprises the calibration system exiting calibration after the calibration system calibrates all working frequency bands of the mobile terminal.
The calibration method of claim 1 wherein the radio frequency parameters are calibration channel and transmit path energy control parameters.
The calibration method according to claim 1, wherein the corresponding parameter in the step C is a control parameter, an output power parameter and a phase parameter of the corresponding power signal.
A method for calibrating a mobile terminal to transmit power in a GSM band includes the following steps:

A. The mobile terminal enters a corresponding working frequency band, the calibration system sets a reference channel of the corresponding working frequency band and a reference radio frequency signal line loss, the calibration system sets a radio frequency parameter of the mobile terminal, and the mobile terminal continuously outputs a series of different powers a signal, the base station emulator of the calibration system reads and stores corresponding parameters of the respective power signals;

B. setting a corresponding radio frequency signal line loss of the next channel of the corresponding working frequency band according to the reference radio frequency signal line loss;

C. The calibration system commands the base station emulator to test the next channel, the calibration system sets radio frequency parameters of the mobile terminal, and the mobile terminal continuously outputs a series of different power signals, and the base station emulator reads The corresponding parameters of the respective power signals are taken and stored.
The calibration method according to claim 9, wherein the step A further comprises the mobile terminal accessing the calibration system, and the mobile terminal is in a calibration mode.
The calibration method according to claim 9, wherein the calibration method further comprises repeating the step B and the step C to obtain corresponding parameters of each channel of the corresponding working frequency band, and the base station emulator will Corresponding parameters of each channel of the corresponding working frequency band are stored in the mobile terminal.
The calibration method according to claim 11, wherein the calibration method further comprises the calibration system instructing the base station emulator to calibrate another operating frequency band of the mobile terminal, and repeating the step A to the step C .
The calibration method according to claim 12, wherein the calibration method further comprises the calibration system exiting calibration after the calibration system calibrates all working frequency bands of the mobile terminal.
The calibration method of claim 9 wherein the radio frequency parameters are calibration channel and transmit path energy control parameters.
The calibration method according to claim 9, wherein the corresponding parameter in the step C is a control parameter, an output power parameter and a phase parameter of the corresponding power signal.